Confluence Throws ERROR: 400 in Browser When Manually Uploading Add-Ons
Platform notice: Server and Data Center only. This article only applies to Atlassian products on the Server and Data Center platforms.
Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
When uploading an Add-On through the Upload add-on link, the Uploading box does not update and the browser gets stuck waiting.
Using Ctrl+Shift+I and watching the network tab, the following URL appears with a 400 error
- https://confluence.mycompany.com/confluence/rest/plugins/1.0/?token=7522426583166574927
And this error appears in the server response detail (this can be also seen in a HAR file).
<html><head><title>Error</title></head><body>
<h2>ERROR: 400</h2>
<br>
</body></html>Nothing is shown in atlassian-confluence.log or catalina.out.
Diagnosis
Environment
- Confluence is running behind a reverse proxy
Cause
The reverse proxy is not allowing the upload of the file.
Resolution
Set up a non-proxied <Connector /> in server.xml and use that for uploading the Add-On. You can review the documentation here